s

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs,Unit2, StdCtrls,Unit3, DB, ADODB;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Label1: TLabel;
    Label2: TLabel;
    Edit1: TEdit;
    Edit2: TEdit;
    ADOQuery1: TADOQuery;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
var
Form2:TForm2;
implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
Unit2.Form2.Show;
 ADOQuery1.SQL.Clear;
 ADOQuery1.SQL.Text:= 'SELECT* from Users where UserName=:username and password=:password';
 ADOQuery1.Parameters.ParamByName('username').Value:=Edit1.Text;
 ADOQuery1.Parameters.ParamByName('password').Value:=Edit2.Text;
 ADOQuery1.Open;
 if not ADOQuery1.isEmpty then
 showmessage('Success')
 else
 showmessage('Fail')

 //showmessage('Welcome!');
end;

end.